Mathieu Lallemand fell here in the Fallaises at Rochehaut on 22 June 2003 and he later died of his injuries.
He is the founder of walking club "Randonée Sauvage". Remarkably, the first walk he organised was a walk here in the Fallaises on 19 September 1977.
Randonnée Sauvage wants to keep the spirit of Mathieu alive and organises walks, hiking weekends and a summer walk.
The memorial plaque is located along the GR16 trail on the ladder walk, a very adventurous walk in Belgium. The hike was closed several times due to too dangerous, but since the investment of 75,000€ in new ladders at the end of 2015, the hike has been safe for anyone who can overcome the fears.